HC157 查看數據表（PDF） - STMicroelectronics
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HC157 Datasheet PDF : 11 Pages
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M54/M74HC157 M54/M74HC158
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, Input tr = tf = 6 ns)
Symbol
Parameter
Test Conditions
VCC
(V)
TA = 25 oC
54HC and 74HC
Value
-40 to 85 oC -55 to 125 oC Unit
74HC
54HC
Min. Typ. Max. Min. Max. Min. Max.
tTLH Output Transition 2.0
tTHL Time
4.5
30 75
8
15
95
110
19
22
ns
6.0
7
13
16
19
tPLH Propagation
2.0
tPHL Delay Time
4.5
(A, B - Y)
6.0
30 100
125
150
12 20
25
30
ns
10 17
21
26
tPLH Propagation
2.0
tPHL Delay Time
4.5
(SELECT - Y)
6.0
50 125
155
190
16 25
31
38
ns
14 21
26
32
tPLH Propagation
2.0
tPHL Delay Time
4.5
(STROBE - Y)
6.0
36 115
145
175
12 23
29
35
ns
10 20
25
30
CIN Input Capacitance
5
10
10
10 pF
CPD (*) Power Dissipation
47
Capacitance
pF
(*) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load.
(Refer to Test Circuit). Average operting current can be obtained by the following equation. ICC(opr) = CPD •VCC •fIN + ICC/4 (per channel)
SWITCHING CHARACTERISTICS TEST CIR-
CUIT
TEST CIRCUIT ICC (Opr.)
6/11
INPUT WAVEFORM IS THE SAME AS THAT IN CASE OF
SWITCHING CHARACTERISTICS TEST.
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